The JBX03192 50-meter 400G QSFP-DD active optical breakout cable represents the cutting edge of data center interconnect technology. Engineered as a direct substitute for Cisco's QDD-4X100G-AOC50M (part number QDD-4X100G-AOC50M), this solution bridges the gap between legacy 100G infrastructure and modern 400G deployments with exceptional flexibility and performance. **Technical Specifications:** This breakout AOC features a single QSFP-DD connector on one end and four QSFP28 connectors on the other, enabling 400G-to-4x100G signal distribution. Built with 16 strands of OM3 50/125 multimode fiber, it supports the 400GBASE-SR4.2 transmission standard defined by IEEE 802.3bs. The 50-meter length accommodates extended intra-data-center runs while maintaining optimal signal quality. The cable features plastic jacketing with LSZH (Low Smoke Zero Halogen) rating (OFNR classification), meeting stringent fire codes and environmental regulations. **Performance and Reliability:** Designed for sustained operation between 0-70°C, this AOC maintains consistent performance across demanding data center environments. The active optical technology eliminates the need for external power adapters while delivering superior performance compared to passive copper alternatives. Full compliance with IEEE 802.3bs, QSFP-DD MSA, and CMIS specifications ensures compatibility with next-generation network equipment. **Safety and Compliance:** Comprehensively certified for Class 1 Laser safety (UL, FDA 21CFR 1040.10), TUV certified, and RoHS/ELV compliant per EU directive 2002/95/EC. These certifications guarantee safe operation in professional environments and adherence to environmental standards. **Ideal Applications:** Perfect for data center operators, network architects, and telecommunications providers upgrading from 100G to 400G infrastructure without complete hardware replacement. The breakout functionality provides graceful migration paths for existing QSFP28-based systems. **Warranty and Support:** Each cable includes a 90-day limited warranty. Custom brand programming is available for enterprises with specific requirements. Ships from multiple U.S. locations (Danville, CA and Beaufort, SC) with free standard shipping on orders exceeding $99.